Right-click on your desktop
and select "Properties" from the popup menu.
Then select the "Screensaver" tab in the
"Display Properties" dialog. Using the scrolling
menu, select the
FreeFishScr as your
default.

You probably just need to update your graphics
driver.Please be sure to install the latest
video drivers directly from your video card
manufacturer.
The internal Windows drivers may not support
hardware accelerated OpenGL.

You can also update your graphics card drivers
by following the steps.
1. Go to your control panel.
2. Click on Hardware and Sound.
3. Click on Device Manager.
4. Go to Display Adapters.
5. Right click on your videocard and select
'Update Driver Software'.
6. Then choose 'Search automatically for updated
driver software'.
7. Now it's searching for new driver software.
8. Now wait till it's done and restart your
computer.